Factorise :
(a2 - b2) c + (b2 - c2)a
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= a2c - c2a + b2a - b2c
= ac(a - c) + b2(a - c)
= (a - c)(ac + b2)
Hence,(a2 - b2) c + (b2 - c2)a = (a - c)(ac + b2)
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x2 - (a - 3)x - 3a
ab2 - (a - c) b - c
a3 - a2 - ab + a + b - 1
ab(c2 + d2) - a2cd - b2cd